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Table 2 Overall results comparing PPG with DG

From: A comparison between pylorus-preserving and distal gastrectomy in surgical safety and functional benefit with gastric cancer: a systematic review and meta-analysis

  No. of studies OR/WMD (95%CI) P Heterogeneity Effect model
I2 P
Age 12 0.19 (− 1.71, 2.09) 0.845 87.90 0.000 Random
Gender 17 0.83 (0.73, 0.94) 0.005 0.00 0.876 Fixed
BMI (kg/m2) 7 − 0.02 (− 0.24, 0.19) 0.828 0.00 0.587 Fixed
Tumor size (cm) 6 0.02 (− 0.09, 0.13) 0.767 31.50 0.200 Fixed
Operation time (min) 9 − 5.00 (− 13.53, 3.54) 0.251 76.30 0.000 Random
Blood loss (ml) 7 − 19.85 (− 45.14, 5.44) 0.124 74.90 0.001 Random
Proximal resection margin (cm) 4 − 0.47 (− 0.91, − 0.03) 0.038 74.30 0.009 Random
Distal resection margin (cm) 4 − 2.76 (− 4.96, − 0.57) 0.013 98.20 0.000 Random
Retrieved lymph nodes 8 − 1.10 (− 2.18, 0.01) 0.048 8.70 0.363 Fixed
Postoperative hospital stay (day) 8 0.98 (0.66, 1.29) 0.000 30.60 0.184 Fixed
Complications 12 0.97 (0.76, 1.25) 0.835 5.70 0.389 Fixed
Anastomotic leakage 10 0.49 (0.24, 0.97) 0.041 0.00 0.946 Fixed
Gastritis 8 0.22 (0.07, 0.74) 0.014 71.30 0.001 Random
Esophagitis 4 1.21 (0.56, 2.61) 0.621 37.90 0.185 Fixed
Bile reflux 6 0.30 (0.10, 0.89) 0.031 57.90 0.037 Random
Early dumping syndrome 4 0.18 (0.07, 0.44) 0.000 0.00 0.982 Fixed
Gallbladder stones 6 0.63 (0.38, 1.03) 0.063 14.60 0.320 Fixed
Gastric stasis 11 1.88 (1.23, 2.87) 0.003 38.40 0.093 Fixed
Gastric emptying times (50%, min) 3 8.86 (1.71, 16.00) 0.015 0.00 0.433 Fixed
Total protein* 7 0.39 (0.25, 0.53) 0.000 34.60 0.164 Fixed
Albumin* 7 0.31 (0.17, 0.44) 0.000 22.00 0.261 Fixed
Hemoglobin* 5 0.55 (0.39, 0.71) 0.000 0.00 0.576 Fixed
Body weight loss (Kg) 8 3.24 (1.79, 4.69) 0.000 65.30 0.005 Random
Recurrence 6 1.41 (0.68, 2.89) 0.355 0.00 0.932 Fixed
Overall survival rate 3 0.63 (− 0.06, 1.32) 0.074 0.00 0.951 Fixed
  1. P < 0.05 are indicated in bold
  2. OR odds ratio, WMD weight mean difference, CI confidence interval
  3. *Effect size is presented by standardized mean difference (SMD)